Hello all I would like to find an algorithm to caclulate all options on the following problem. Lets suppose we have a room of max capacity of 4 persons. Which are the combinations of man - child in this room? some of them will be: empty room (none inside) 1 man 1 child 2 men 2 children 2 men 1 children 2 men 2 children . . 4 men 4 children I appreciate your help -- Posted via http://www.ruby-forum.com/.